332 GENERAL PLANT PATHOLOGY 



acaulosia would signify, is an impossibility in a typic plant. The term 

 is purely a relative one. 



AcheHary (Ch. Morren). — The suppression of the labellum in such 

 flowers as the Orchidace^. 



Adesmy (Ch. Morren). — Congenital separation of organs which 

 are normally united together, therefore, often included as atavism. 

 Morren distinguishes between homologous adesmy as the separation 

 of members of one whorl and heterologous adesmy the separation of the 

 members of one whorl from those of another. 



Adenopetaly. — Formation of a nectary in a former nectarless petal. 



Adhesion. — Normally used for the union of parts of different whorls 

 in the flower, for example, the union of a sepal with a petal, or of a 

 stamen with a carpel, and also for fusion in general (of a branch with 

 the main axis, of a leaf with a branch, etc.). 



Adherence (Moquin-Tandon). — Fusion of organs which normally 

 are separate. 



Anaeretic (Schimper, 1854). — Under foliatio anaretica, C. Schimper 

 obviously understood the abnormal arrangement of leaves on an axis 

 in a single row, a condition sometimes produced by a torsion, or twisting 

 of the axis. 



Antheiophylly (Ch. Morren). — Formation of anthers upon leaf 

 blades. 



Anthesmolysis (Engelmann). — Central or lateral metamorphosis 

 of an inflorescence, especially of heads as in the Dispacese and 

 Compositae. 



Antholysis (Spenner in Flor. Fribiu-g). — A solution of flowers, 

 particularly applied to the condition in which the axis becomes elongated 

 and the flower whorls separated from each other. 



Aphylly. — The condition of the plant in which leaves are suppressed. 



Apilaiy (Ch. Morren). — Suppression of the upper lip in normally 

 bilabiate flowers, as in Calceolaria. 



Apogamy. — ^Vegetative reproduction of plant indi\'iduals instead 

 of by the usual method with sex organs, especially used with reference 

 to ferns where the antheridia and archegonia are suppressed or not 

 functional, the young plant arising directly from the prothallium. It 

 is also used for the non-sexual formation of embryos in the embryo sac 

 of the phanerogams. 



Apophysis, — Vegetative, central proliferation of an inflorescence. 



